How To Make a Digital Clock

How DO you make a digital clock?

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Sources:
http://makezine.com/2015/09/16/this-is-ahmed-mohameds-clock/
http://electronics.stackexchange.com/questions/117624/how-does-a-crystal-work
http://electronics.howstuffworks.com/digital-electronics.htm
http://electronics.howstuffworks.com/gadgets/clocks-watches/digital-clock1.htm
What does a frequency of 100 Hz mean?
http://www.nationalhomelandsecurityknowledgebase.com/Research/International_Articles/Bomb_Basics.html
http://science.howstuffworks.com/controlled-detonation4.htm